Title (en)

ON-COLUMN CONDUCTIVITY DETECTOR FOR MICROCOLUMN ELECTROKINETIC SEPARATIONS

Publication

EP 0295942 A3 19891129 (EN)

Application

EP 88305557 A 19880617

Priority

US 6354787 A 19870617

Abstract (en)

[origin: EP0295942A2] An on-column conductivity detector for microcolumn electrokinetic separation systems is disclosed. The detector is based on the column itself, the column having a largest internal cross-sectional dimension of 500 microns or less and includes one or more sensing electrodes positioned directly upon or immediately adjacent to (i.e. contiguous with) the wall of the column into communication with the analyte stream so as to present no dead volume and no increase in cross-sectional area to the fluid flow. In one embodiment, this conductivity detector has a single on-column electrode, located immediately adjacent to the exit end of the column. In a preferred embodiment, this conductivity detector has one or more pairs of on-column sensing electrodes and these paired electrodes are located directly across from each other on the microcolumn, to minimize potential across the electrodes and concomitant electrochemical reactions.

IPC 1-7

G01N 15/10; G01N 27/60

IPC 8 full level

G01N 30/02 (2006.01); B01D 57/02 (2006.01); G01N 15/10 (2006.01); G01N 27/07 (2006.01); G01N 27/447 (2006.01); G01N 27/60 (2006.01); G01N 37/00 (2006.01)

CPC (source: EP)

B01D 57/02 (2013.01); G01N 27/07 (2013.01); G01N 27/4473 (2013.01)

Citation (search report)

• [Y] US 3788969 A 19740129 - DI STEFANO V, et al
• [Y] DE 1598930 B2 19740815
• [A] US 4484582 A 19841127 - ROTTENBERG DAVID A [US], et al
• [A] FR 1533087 A 19680712
• [A] EP 0216600 A2 19870401 - UNIV LELAND STANFORD JUNIOR [US]
• [YD] ANALYTICAL CHEMISTRY, vol. 56, 1984, pages 479-482, Washington, DC, USA; L.A. KNECHT et al.: "On-Column Electrochemical Detector with a Single Graphite Fiber Electrode for Open-Tubular Liquid Chromatography"
• [AD] JOURNAL OF CHROMATOGRAPHIC SCIENCE, vol. 23, May 1985, pages 186-191; R.L. ST. CLAIRE et al.: "Characterization of an On-Column Electrochemical Detector for Open-Tubular Liquid Chromatography"
• [AP] ANALYTICAL CHEMISTRY, vol. 59, no. 23, December 1987, pages 2747-2749, Washington, DC.USA; X. HUANG et al.: "On-Column Conductivity Detector for Capillary Zone Electrophoresis"

Designated contracting state (EPC)

AT BE CH DE ES FR GB GR IT LI LU NL SE

DOCDB simple family (publication)

EP 0295942 A2 19881221; EP 0295942 A3 19891129; EP 0295942 B1 19940406; AT E104053 T1 19940415; CA 1339779 C 19980324; DE 3888878 D1 19940511; DE 3888878 T2 19940728; JP 2000046798 A 20000218; JP 3011914 B2 20000221; JP H01158342 A 19890621; JP H10185870 A 19980714

DOCDB simple family (application)

EP 88305557 A 19880617; AT 88305557 T 19880617; CA 569134 A 19880609; DE 3888878 T 19880617; JP 14923488 A 19880616; JP 22806599 A 19990811; JP 31879897 A 19971119